new style tab whistles.min.css

It would be good that you add the ability to add new styles.
To upgrade plug styles did not disappear.

At this point I add here another style.
Maybe someone will come in handy.
And when you upgrade that I could quickly restore the style I want.

Style Accordion
whistles.min.css:

.whistles{clear: both;width: 100%;margin: 0 0 1.5rem;font-family:Georgia,sans-serif;line-height:1.5}
.whistles::after,.whistle-content::after{content: ".";display: block;height: 0;clear: both;visibility:hidden}
.whistle-title:hover{cursor:pointer}
.whistle-content{overflow:hidden}
.whistles-tabs{}
.whistles-tabs .whistles-tabs-nav{list-style:none;margin:0}
.whistles-tabs .whistles-tabs-nav li{display:inline-block}
.whistles-tabs .whistles-tabs-nav li a{
	display: inline-block;
	padding: 0.5rem 1.5rem;
	font-size: 0.75em;
	font-family: Arial,sans-serif;
	font-weight: bold;
	color: #777;
	background: #f5f5f5;
	border: 1px solid #ececec;
	border-right-width:0
	}
.whistles-tabs .whistles-tabs-nav li:last-child a{border-right-width:1px}
.whistles-tabs .whistles-tabs-nav li a:hover{color: #555;background:#f9f9f9}
.whistles-tabs .whistles-tabs-nav li[aria-selected="true"] a{color: #555;background: #fff;border-bottom-color:#fff}
.whistles-tabs .whistles-tabs-wrap{margin: -1px 0 0;padding: 1.5rem 1.5rem 0 1.5rem;color: #666;background:#fff;border: 1px solid #ececec}
.whistles-tabs-wrap .whistle-content{}
.whistles-toggle,.whistles-accordion{}
.whistles-toggle .whistle-title,.whistles-accordion .whistle-title{
	margin: 0;
	padding: 9px 15px;		/* было padding: 0.5rem 1.5rem;*/
	font-size: 16px;			/* было font-size: 0.75em;*/
	font-family: Arial,sans-serif;
	text-shadow: none;		/*не было этой строчки, ибо стили темы добавляют свою тень текста */
	/* было font-weight: bold; */
	color: #7E7878;			/* было color: #777;*/
	background: #383838;		/*было background: #f5f5f5;*/
	border-bottom: 1px solid #F5F4E5; /* было border: 1px solid #ececec; */
	border-top-width:0
	}
.whistles-toggle .whistle-title:first-child,.whistles-accordion .whistle-title:first-child{
	border-top-width:1px
	}
.whistles-toggle .whistle-title:hover,.whistles-toggle .whistle-title[aria-selected="true"],.whistles-accordion .whistle-title:hover,.whistles-accordion .whistle-title[aria-selected="true"]{
	color: #0087F1;/* было color: #555; */
	/* было background:#ededed */
	text-shadow: none;
	}
.whistles-toggle .whistle-content,.whistles-accordion .whistle-content{
	margin: -1px 0 0;
	padding: 16px; /* было padding: 1.5rem 1.5rem 0 1.5rem;*/
	color: #666;
	background:#fff;
	border: 1px solid #ececec;
	-moz-box-sizing:border-box;
	box-sizing:border-box
	}